could usurp
Regular verb: usurp - usurped- usurped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could usurp
you could usurp
he could usurp
we could usurp
you could usurp
they could usurp 	I could be usurping
you could be usurping
he could be usurping
we could be usurping
you could be usurping
they could be usurping	I could have usurped
you could have usurped
he could have usurped
we could have usurped
you could have usurped
they could have usurped	I could have been usurping
you could have been usurping
he could have been usurping
we could have been usurping
you could have been usurping
they could have been usurping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't usurp
you couldn't usurp
he couldn't usurp
we couldn't usurp
you couldn't usurp
they couldn't usurp 	I couldn't be usurping
you couldn't be usurping
he couldn't be usurping
we couldn't be usurping
you couldn't be usurping
they couldn't be usurping	I couldn't have usurped
you couldn't have usurped
he couldn't have usurped
we couldn't have usurped
you couldn't have usurped
they couldn't have usurped	I couldn't have been usurping
you couldn't have been usurping
he couldn't have been usurping
we couldn't have been usurping
you couldn't have been usurping
they couldn't have been usurping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I usurp?
could you usurp?
could he usurp?
could we usurp?
could you usurp?
could they usurp? 	could I be usurping?
could you be usurping?
could he be usurping?
could we be usurping?
could you be usurping?
could they be usurping? 	could I have usurped?
could you have usurped?
could he have usurped?
could we have usurped?
could you have usurped?
could they have usurped? 	could I have been usurping?
could you have been usurping?
could he have been usurping?
could we have been usurping?
could you have been usurping?
could they have been usurping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I usurp?
couldn't you usurp?
couldn't he usurp?
couldn't we usurp?
couldn't you usurp?
couldn't they usurp? 	couldn't I be usurping?
couldn't you be usurping?
couldn't he be usurping?
couldn't we be usurping?
couldn't you be usurping?
couldn't they be usurping? 	couldn't I have usurped?
couldn't you have usurped?
couldn't he have usurped?
couldn't we have usurped?
couldn't you have usurped?
couldn't they have usurped? 	couldn't I have been usurping?
couldn't you have been usurping?
couldn't he have been usurping?
couldn't we have been usurping?
couldn't you have been usurping?
couldn't they have been usurping?